Casting functions now check for NULL as of last commit.

The code I added to make NiTriBasedGeom select the correct skeleton root was wrong and has been re-written and tested.  It now seems to select the same skeleton root as real NIF files.
The NiTriBasedGeomData::SetUVSetCount function now sets the hasUVs bool value correctly.
Fixed some skin related bugs in ComplexSh::Split.

Commented out functions written by Amorilia that I need to figure out how to fix.

Major update to python generation scripts and others.  Currently just namepace and mutable size members with appropriate generated code.

Implemented functions for NiTriShapeData and made old NiTriBasedGeomData functions work with the new system and removed the necessity to re-size the vertex count before setting new vertices.  NiTriBasedGeomData::SetVertices now simply clears out all other data.
Radius and Center functions should be removed from DocSys.

Made all include paths relative so you don't have to set any directories to compile.  Hopefully Amorilia will fix this in the code generation script.
Implemented a few more functions.